Process of producing multicolor effects on vegetable fibers and product thereof



Patented Aug. 3,. 1926.

UNITED STATES .runrusnarn AND WILHELM crmrsr, or QFFENBACH-ON-THE-MAIN, GERMANY, AS-

PATENT orifice;

SIGNORS TO THE 1. G. FARBENINDUSTRIE AKTIENGESELLSCHAFT, OF FRANK.-

ronr omrnn-ueln, GERMANY.

PRODUCT THEREOF.

No Drawing. Application filed January 15,. 1925, Serial No. 2,604, and in Germany February 7, 1924.

. t y I Hitherto itwas not possible to produce multi-color eflects or combined shades in colored textile fabrics or one-color cotton goods by superimposing vat dyestuffs on ortions of said fabrics or goods previously yed with azodyestufi's.

Now we have found that such azodyestuffs as are resistant to the action of boiling dilute caustic soda solution in the presence of cellulose," that is fast to' kier-boiling, can be given a superimposed printing "or dyeing with vat dyestuffs without damage tothe underlying primary dyeing. In this manner multi-color effects and combined shades of an excellent fastness may be obtained.

. instability of azodyestufl's against'an alkaline hydrosulfite solution the possibility of such a dyeing method is very surprising.

-As azodyestufis we may use for this proc ess especially the insoluble azodyestuifs pro duced by development on the fiber, so far as their colorings are fast to boiling caustic soda solution or kierboiling, such as for example the combinations with the arylamides of 2.3-oxynaphthoic acid, as described in the U. S. A. Letters Patent No. 1,034,853, 3 dated Aug. 6, 1912, and in the later publications, based on this fundamental patent, or the dyestuffs, derived from acylacetylamines, as described in the U. S. A. Letters Patents No. 1,505,568 and,1, 505,569, bothdated June 10, 1924, and the U. S. A. application of Arthur Zitscher,-Serial No. 641,510, filed May 25, 1923, and the like. 7

The following examples illustrate the invention, the parts being by weight.

Example 1.

Cotton yarn, previously dyed accordin to the process, described in the UPS. A. tters Patent No. 1,099,108, dated June 2, 1914, with:

4-nitro -1.2-an1sidin upon 2.3-oxynaphthoyl-beta-naphthylamin or 2.5-dic'hloroaniing: C. Duration of dyeing: hour. Bright and full red or scarlet shades on a light violet ground are obtained.

E wample 2. v Colored webs from cotton-yarn, previously dyed as in example 1 with 4-chloro-L2-toluidin upon 2.3-oxynaphthoyl-fl-naphthylamin or 5-chloro-1.2-toluidin upon 2.3-oxynaphthoyl-5-chloro-2-anisidin, and white are I overcrossed With 1% of indanthrene blue G C, 20 cc. of caustic soda solution of B., 2 g. ofhydrosulfite, concentrated powder, in 1 liter of liquor. Liquor: 1:10.

1 Temperature of dyeing: 60? C. Dura- Taking into consideration the well known tion of dyeing: hour.

Dark red to Bordeaux-red shades on a light blue ground result. a Example 3.

Cotton goods, previously dyed according to the ice colors method with ortho-chloroanilin upon d aceto-acetyl-ortho:tolidin (see .U. S. A. Letters Patent No. 1,505,568) are overdyed with 10% of alizarine indigo. 7 .G,'- 15 cc. of caustic soda solution of 30 B.,

3 g. of hydrosulfite concentrated powder, in 1 liter of liquor. iquor: 1:10. Temperature of dyeing 85 C. Duration of dyeing: hour.

Pure brilliant greenshades are obtained.v

The method of padding (see U. S. A. Letters Patent No. 893,384, dated July 14;, 1908) may also be used.

Emample 4. I The goods, previously dyed with orthochloroanilin upon diacetoacetyl-ortho-toli din, are printed with the following printingcolor and dried.

Printing-color 220 g. of neutral tragacanth-thickening, 300 g. ofgum 1:1,

140 g. of potash,-, I 90 g. of glycerin, I g v of rongalit G are heated, after cooling down poured into,

150 'g. of alizarine indigo .7 G in paste.

The rinted goods are steamed with wet steam or 3-5 minutes in a rapid steamerapparatus, free of air, then chromed ,at

. 50-60 0. (2 gr. of bichromate, 5 cc. of

acetic acid of 6 B. in the liter), rinsed and soaped.

A green design upon a yellow ground is obtained.

Example 5.

tolidin, woven with white to colored textile R fabrics, is overdyed with 3%of algolbrilliantviolet R, 4 cc. of caustic soda solution of 30 B;, 2' of hydrosulfite, concentrated wder, in 1%iter of liquor. Liquor: 1:10. emperature of dyeing: 50 C. Duration of dyeing: hour;

- Clear brown shades on a light violet ground are obtained.

Having now particularly described and ascertained the nature of our said invention and in what manner the same to be performed, we declare, that what we claim 1s:

fects or combined shades on the vegetable fiber, consisting in superimposing vatdyestuffs on fabric portions which have been previously treated with such azodyestufi's as are resistant to the action of boiling dilute caustic soda solution in the presence of cellulose, that is, fastto kier-boiling. r v

2. Materials dyed or printed according to claim 1.

In testimony, that we claim the foregoing as our invention, we have signed our names, this 31st da 'of- December, 1924.

DR. LIUS BATH. DR. WILHELM CHRIST..

1. A process of producingmulti-color ef- 

